✍ Scribed by Hans-Georg Bartel; Marianne Nofz
No coin nor oath required. For personal study only.
After explaining the mathematical background of formal concept analysis this method was applied to 29Si-NMR data (chemical shift and full width at half height of the corresponding signals) of 31 calcium-aluminosilicate glasses. Conceptual scaling of the data was necessary to transform the experimental data into a single-valued context. Interpretation of the results was performed on the basis of a structural model <Qy units model) for the glasses developed intuitively in a previous work. The results of the formal concept analysis applied to the NMR data and to the composition of the glasses in terms of distinct structural units allowed a confirmation of the Qr model.
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A novel technique to introduce high energy ion beams to atmospheric environment is presented, which enables in-air PIXE measurements. Slightly tapered glass capillary optics is applied to work as a differential pumping orifice as well as a focusing lens. The flux intensity is enhanced by at least on